Ejector for box-pressing machines



M. R. KDNDOLF.

HECTOR FUR BOX PRESSING MACHINES.

APPLICATION FILED now-14, 19!].

1,355,113, Patented Oct. 5,1920.

I [Vi [N705 MATHIAS R. KONDOLF, OF ROCHESTER, NEW YORK.

EJEGTOR FOR BOX-PRESSING- MACHINES.

Specification of Letters Patent.

Patented Oct. 5, 1920.

Application filed November 14, 1917. Serial No. 202,028.

To all whom it may concern:

Be it known that I, MATHIAs R. KoNnoLF, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented new and useful Improvements in an Ejector for Box-Pressing Machines, of which the following is a specification.

The object of this invention is to provide a new method and an improved device for he ejectment or stripping of boxes from the dies of a box pressing machine.

This invention relates in particular to an improved device to strip or eject from the pressing dies, boxes which aremade up of a plurality of layers of material with adhesive between the layers and which layers are forced together by means of a male and a female die suitably mounted in a press.

In the manufacture of boxes of this kind it is most important that when they are in the press that the pressing dies do not tend to slide the layers relatively upon each other, otherwise the shape of the box is affected; for this reason it is desirable that when the layers are placed within the female form (or around the male formif the box is thus made) that the stripper plate of the form or die first receiving the layers of box making material be held in a retracted position or in the position which it will occupy during the actual pressing of the box. It. is

obvious that if both stripper plates are simply supported by springs and operated by the springs after the box is pressed, the stripper plates in order to function later must be moved or forced apart by the pressing operation, thus causing the box to, be floated by the spring supported stripper plates, with a consequent great tendency to distort the box.

In Figure 1 I have shown my improved ejector attached to a box pressing machine. The stripper plates being in normal position to receive within the lower or female die the la ers of box making material.

In *ig. 2 I have shown a portion of the same machine with the female stripper plate partially raised from normal position and supported by the ejector block, which is in operating position.

In the drawings like numerals represent like parts,in Fig. 1 numeral 1 represents the top yoke and 2 represents the cylinder portion of a press adapted to operate by either pneumatic or hydraulic pressure. The side rods 8 and 4 support the top yoke 1, the table 5 being moved vertically by means of the rod 6. In this particular form of press a piston (not shown) attached to the lower end of the rod 6 and operating in the cylinder 2 supplies the power to move the table and operate the press.

Mounted on the top yoke 1 is the maledie 7 having a stripper plate 8 which plate is guided and supported by the stripper or ejector pins 9. Springs contained within the male die 7 butnot shown in the drawings, serve to hold the plate 8 away from the die 7 by spring pressure.

Mounted on the table 5 is the female die 10 and within the same is the stripper plate 11 which plate is guided and operated by two stripper or ejector pins 12 of which one only is shown in the drawings. The other ejector pin 12 is similarly located on the opposite side of the table 5.

Mounted to slide transversely on the cylinder head 13 is the ejector block 14. The lower ends of the ejector pins 12 strike the ejector block 14 on the contact portions of the same at 15. It will be understood that the ejector block is preferably made in a U-shape form so as to'embrace the center rod which supports the table. The ejector block 14 is beveled as shown at 16, and this beveled portion engages the wedge 17. The wedge 17 is attached to or a part of the table 5 and moves with the same. A coil spring 18 forces the contact portions 15 of the ejector block 14 into position so that the ends of the ejector pins 12 will strike the same when the table is lowered. The ejector block 14 is forced into retracted position against the pressure of the spring 18 by means of the wedge 17. w

As shown in Fig. 1 the table is at its lowest position. The wedge 17 holds the ejector block 14 in retracted position, thus allowing the ejector pins 12 to pass by the ends of the contact portions of the ejector block and therefore the stripper plate 11 is in its normal position in the die and rests directly upon the table 5.

With the machine in the position as shown in Fig. 1, the layers of box making material which have been first suitably coated with an adhesive are now inserted in the female die, the bottom member of the box being in contact with the stripper plate. The table is now raised by means of the rod 6 and the female die is forced up around the male die 7. The wedge 17 is raised with the table, thus allowing the ejector block 14 to move to the left (in Fig. 1) and the contact portions of the ejector block will come under the ejector pins 12. Y

It is evident that the male stripper plate 8 will first engage the bottom of the box, after which the tapered sides of the male die will engage with the walls of the box. The stripper plate 8 will be forced into a re- .tracted position thereby compressing the springs contained in the male die, In this manner the layers of the box are pressed into close contact.

The table5 carrying the female die is now lowered and the male stripper plate 8, moving down, strips the box from the male die flfild thus the box descends with the female c c.

When the table has been lowered far enough the ejector pins 12 will strike the contact portions 15 of the ejector block 14 and during the further lowering of the table the female stripper plate 11 will beheld stationary thereby stripping the box from the female .die. Immediately after the ejector pins strike the ejector block the wedge v17 engages the ejector. block and forces the same to the right (in Fig. 2) as the table is lowered. Just before the table has reached its lowest position the ejector block will have been moved by the wedge 17, far enough to the right to allow the ejector pins 12 to pass by the ends of the ejector block 14 and therefore the stripper plate 11 will drop and make contact directly with the table top, assuming the position shown in Fig. 1. Fig. 2 shows the mechanism with the stripper plate ll partly raised and the ejector block 14 somewhat moved to the right by the wedge 17.

Though I have shown and described but one way in which my improved device may be applied, it is obvious that there are a number of modifications which will come within the spirit, of my invention, for instance, it might be desirable to reverse the position of the dies, mounting the femaledie, which would be inverted, upon the top yoke and the male dies, inverted upon the table. In such'a case the action of ejector would be similar to that shown and described, the male stripper plate normally resting in contact with the male die.

The ejector block 14 may be moved directly by the operator at the pros-er time, but obviously the automatic movement of the same by the wedge 17 is preferable.

The press itself may of course operate by other means than pneumatic or hydraulic pressure and it will be further understood that my improved ejector may be applied with advantage to other processes and apparatus for making and pressing boxes! the such as are shown in United States Letters Patent Number 1,220,517 issued to me March 27th, 1917. V

I claim,

1. An ejector for a box pressing machine comprising a stripper plate, an ejector pin supporting said plate, a movable ejector block adapted to support said ejector pin and cause said stripper plate to be raised from its normal position, a wedge adapted to move said ejector block and thereby allow said stripper plate to assume its normal position.

2. An ejector fora box pressing die com prising a stripper plate, an ejector pin attached thereto, a movable block engaging said pin and supporting said stripper plate away from its normal position and means to move said block and thereby allow said stripper plate to assume its normal position.

3. An ejector for a box pressing machine comprising a stripper plate adapted to operate in conjunction with a box pressing die and normally press the bottom of a box, means to hold said stripper plate stationary while allowing said die to move thereby stripping a box from said die, and means to thereaftercause said stripper plate to assume its normal position. 7 v

4. A machine for making boxes comprising a female die, a stripper plate normally forming the bottom of said die, a male die for pressing the layers of the box into close contact with the female die, means for moving the female die into close contact with the male die, means for withdrawing the female die and the stripper plate to their original position, and means for arresting the movementof the stripper plate before the female die has reached its original position and causing it to eject the box, and means to thereafter cause said stripper plate to assume its normal position.

5. A machine for making boxes comprising a female die, a stripper plate normally forming the bottom of said die, a male die for pressing the layers of the box into close contact with the female die, means for moving the female die into close contact with the male die, means for withdrawing the female die and the stripper plate to their original position, means for arresting the movement of the stripper plate before the female die has'reached its original positionand causing it to eject the box, said 

